Add stub for getentropy

Example test case that fails with undefined reference to getentropy:

Testing g++.robertl/eb77.C,  -std=c++20
doing compile
Executing on host: /build/gcc-13-2709-g9ac9fde961f/bin/arm-none-eabi-g++  /build/src/gcc/gcc/testsuite/g++.old-deja/g++.robertl/eb77.C  -mthumb -march=armv6s-m -mcpu=cortex-m0 -mfloat-abi=soft -fdiagnostics-plain-output   -fmessage-length=0  -std=c++20 -pedantic-errors -Wno-long-long        -Wl,--start-group -lc -lm -Wl,--end-group --specs=nosys.specs -Wl,--allow-multiple-definition -Wl,-u,_isatty,-u,_fstat   -Wl,-wrap,exit -Wl,-wrap,_exit -Wl,-wrap,main -Wl,-wrap,abort -Wl,g++_tg.o -lm -o ./eb77.exe    (timeout = 800)
spawn -ignore SIGHUP /build/gcc-13-2709-g9ac9fde961f/bin/arm-none-eabi-g++ /build/src/gcc/gcc/testsuite/g++.old-deja/g++.robertl/eb77.C -mthumb -march=armv6s-m -mcpu=cortex-m0 -mfloat-abi=soft -fdiagnostics-plain-output -fmessage-length=0 -std=c++20 -pedantic-errors -Wno-long-long -Wl,--start-group -lc -lm -Wl,--end-group --specs=nosys.specs -Wl,--allow-multiple-definition -Wl,-u,_isatty,-u,_fstat -Wl,-wrap,exit -Wl,-wrap,_exit -Wl,-wrap,main -Wl,-wrap,abort -Wl,g++_tg.o -lm -o ./eb77.exe
pid is 28414 -28414
/build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libstdc++.a(random.o): in function `std::(anonymous namespace)::__libc_getentropy(void*)':
(.text._ZNSt12_GLOBAL__N_117__libc_getentropyEPv+0x8): undefined reference to `getentropy'
/build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libstdc++.a(random.o): in function `std::random_device::_M_init(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
(.text._ZNSt13random_device7_M_initERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x58): undefined reference to `getentropy'
/build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libc.a(libc_a-arc4random.o): in function `_rs_stir':
(.text._rs_stir+0x8): undefined reference to `getentropy'
collect2: error: ld returned 1 exit status
pid is -1
close result is 28414 exp6 0 1
output is /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libstdc++.a(random.o): in function `std::(anonymous namespace)::__libc_getentropy(void*)':
(.text._ZNSt12_GLOBAL__N_117__libc_getentropyEPv+0x8): undefined reference to `getentropy'
/build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libstdc++.a(random.o): in function `std::random_device::_M_init(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
(.text._ZNSt13random_device7_M_initERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x58): undefined reference to `getentropy'
/build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/bin/ld: /build/gcc-13-2709-g9ac9fde961f/bin/../lib/gcc/arm-none-eabi/13.0.0/../../../../arm-none-eabi/lib/thumb/v6-m/nofp/libc.a(libc_a-arc4random.o): in function `_rs_stir':
(.text._rs_stir+0x8): undefined reference to `getentropy'
collect2: error: ld returned 1 exit status
 status 1
compiler exited with status 1
FAIL: g++.old-deja/g++.robertl/eb77.C  -std=c++20 (test for excess errors)
Excess errors:
(.text._ZNSt12_GLOBAL__N_117__libc_getentropyEPv+0x8): undefined reference to `getentropy'
(.text._ZNSt13random_device7_M_initERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x58): undefined reference to `getentropy'
(.text._rs_stir+0x8): undefined reference to `getentropy'
UNRESOLVED: g++.old-deja/g++.robertl/eb77.C  -std=c++20 compilation failed to produce executable

Contributed by STMicroelectronics

Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>

3 files changed, 27 insertions, 0 deletions

diff --git a/libgloss/Makefile.in b/libgloss/Makefile.in
index 187d0edb0..7f46375c0 100644
--- a/libgloss/Makefile.in
+++ b/libgloss/Makefile.in
@@ -409,6 +409,7 @@ libnosys_libnosys_a_LIBADD =
 @CONFIG_LIBNOSYS_TRUE@	libnosys/unlink.$(OBJEXT) \
 @CONFIG_LIBNOSYS_TRUE@	libnosys/wait.$(OBJEXT) \
 @CONFIG_LIBNOSYS_TRUE@	libnosys/write.$(OBJEXT) \
+@CONFIG_LIBNOSYS_TRUE@	libnosys/getentropy.$(OBJEXT) \
 @CONFIG_LIBNOSYS_TRUE@	libnosys/_exit.$(OBJEXT)
 libnosys_libnosys_a_OBJECTS = $(am_libnosys_libnosys_a_OBJECTS)
 libobjs_a_AR = $(AR) $(ARFLAGS)
@@ -991,6 +992,7 @@ TEXINFO_TEX = ../texinfo/texinfo.tex
 @CONFIG_LIBNOSYS_TRUE@	libnosys/unlink.c \
 @CONFIG_LIBNOSYS_TRUE@	libnosys/wait.c \
 @CONFIG_LIBNOSYS_TRUE@	libnosys/write.c \
+@CONFIG_LIBNOSYS_TRUE@	libnosys/getentropy.c \
 @CONFIG_LIBNOSYS_TRUE@	libnosys/_exit.c
 
 @CONFIG_LM32_TRUE@lm32_libgloss_a_SOURCES = \
@@ -1558,6 +1560,8 @@ libnosys/wait.$(OBJEXT): libnosys/$(am__dirstamp) \
 	libnosys/$(DEPDIR)/$(am__dirstamp)
 libnosys/write.$(OBJEXT): libnosys/$(am__dirstamp) \
 	libnosys/$(DEPDIR)/$(am__dirstamp)
+libnosys/getentropy.$(OBJEXT): libnosys/$(am__dirstamp) \
+	libnosys/$(DEPDIR)/$(am__dirstamp)
 libnosys/_exit.$(OBJEXT): libnosys/$(am__dirstamp) \
 	libnosys/$(DEPDIR)/$(am__dirstamp)
 
@@ -1958,6 +1962,7 @@ distclean-compile:
 @AMDEP_TRUE@@am__include@ @am__quote@libnosys/$(DEPDIR)/execve.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@libnosys/$(DEPDIR)/fork.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@libnosys/$(DEPDIR)/fstat.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@libnosys/$(DEPDIR)/getentropy.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@libnosys/$(DEPDIR)/getpid.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@libnosys/$(DEPDIR)/gettod.Po@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@libnosys/$(DEPDIR)/isatty.Po@am__quote@
diff --git a/libgloss/libnosys/Makefile.inc b/libgloss/libnosys/Makefile.inc
index 5e69072e7..334f694af 100644
--- a/libgloss/libnosys/Makefile.inc
+++ b/libgloss/libnosys/Makefile.inc
@@ -24,4 +24,5 @@ multilibtool_LIBRARIES += %D%/libnosys.a
 	%D%/unlink.c \
 	%D%/wait.c \
 	%D%/write.c \
+	%D%/getentropy.c \
 	%D%/_exit.c
diff --git a/libgloss/libnosys/getentropy.c b/libgloss/libnosys/getentropy.c
new file mode 100644
index 000000000..5c4d3a834
--- /dev/null
+++ b/libgloss/libnosys/getentropy.c
@@ -0,0 +1,21 @@
+/*
+ * Stub version of getentropy.
+ */
+
+#include "config.h"
+#include <_ansi.h>
+#include <_syslist.h>
+#include <errno.h>
+#undef errno
+extern int errno;
+#include "warning.h"
+
+int
+_getentropy (void *buf,
+        size_t buflen)
+{
+  errno = ENOSYS;
+  return -1;
+}
+
+stub_warning(_getentropy)