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Before the build system used something like
echo "int main(){} void _exit(int n) {(void)n;while(1);}" | LC_ALL=C $(LINK) -xc - -o /dev/null -lc -Wall -Wextra -pedantic <FLAGS_TO_TEST>
to check for flags supported by the compiler (used as linker frontend).
This however no longer works with newlib 4.3.0, which requires the
symbols `_sbrk_r`, `_close_r`, `_lseek_r`, `_read_r`, and `_write_r` to
be present. Instead, now a new file `minimal_linkable.c` was added that
adds all the missing symbols and is used in the linker feature tests
instead.
16 lines
523 B
Markdown
16 lines
523 B
Markdown
Test Programs
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=============
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This folder contains a collection of test programs for use by the build system,
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e.g. to check for compiler features.
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`minimal_linkable.c`
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--------------------
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This is a minimal C program that is expected to compile and link with all
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supported versions of GCC and newlib.
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Note: We currently even link with GCC when compilation is done with LLVM. It is
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expected to compile and link fine with LLVM as well, but may require more some
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additional flags to find the embedded C lib to link against.
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