Translate-c regression - error, when using multiple #pragma once when also including a libc header #25410
Description
Zig Version
0.16.0-dev.463+f624191f9
Steps to Reproduce and Observed Behavior
This is a stripped down repro of an issue I was seeing while trying to use build.zig to translate headers from this library: https://github.com/richgel999/miniz
I'm using Windows 10, if that makes a difference.
Create a header file (test.h) with these contents:
#pragma once
#include <time.h>
#pragma once
Run this command on the header:
zig translate-c -lc test.h
On Zig 0.16.0-dev.463, it returns an error.
If I remove any of those lines in test.h, then the error does not occur.
The error (I replaced spaces with newlines, in case that made it more legible):
error: the following build command failed with exit code 1:
C:\Users\kavika\AppData\Local\zig\o\189f1ed682f34b880cfec35678bf38cf\translate-c.exe
-x
c
-isystem
C:\Users\kavika\.zvm\master\lib\compiler/aro/include
-fno-PIE
-fPIC
-g
-gcodeview
-fno-lto
-MD
-MV
-MF
C:\Users\kavika\AppData\Local\zig\tmp\c7e498ef919a9372-test.h.d
-fhosted
-nostdinc
-D__MSVCRT_VERSION__=0xE00
-D_WIN32_WINNT=0x0a00
-isystem
C:\Users\kavika\.zvm\master\lib\include
-isystem
C:\Users\kavika\.zvm\master\lib\libc\include\x86_64-windows-gnu
-isystem
C:\Users\kavika\.zvm\master\lib\libc\include\generic-mingw
-isystem
C:\Users\kavika\.zvm\master\lib\libc\include\x86_64-windows-any
-isystem
C:\Users\kavika\.zvm\master\lib\libc\include\any-windows-any
-O0
-target
x86_64-windows.win10_cu...win10_cu-gnu
-mcpu=znver3-16bit_mode-32bit_mode-3dnow-3dnowa+64bit+adx+aes+allow_light_256_bit-amx_avx512-amx_bf16-amx_complex-amx_fp16-amx_fp8-amx_int8-amx_movrs-amx_tf32-amx_tile-amx_transpose+avx-avx10_1-avx10_2+avx2-avx512bf16-avx512bitalg-avx512bw-avx512cd-avx512dq-avx512er-avx512f-avx512fp16-avx512ifma-avx512pf-avx512vbmi-avx512vbmi2-avx512vl-avx512vnni-avx512vp2intersect-avx512vpopcntdq-avxifma-avxneconvert-avxvnni-avxvnniint16-avxvnniint8+bmi+bmi2-branch_hint+branchfusion-bsf_bsr_0_clobbers_result-ccmp-cf-cldemote+clflushopt+clwb+clzero+cmov-cmpccxadd+crc32+cx16+cx8-egpr-enqcmd-ermsb-evex512+f16c-false_deps_getmant-false_deps_lzcnt_tzcnt-false_deps_mulc-false_deps_mullq-false_deps_perm-false_deps_popcnt-false_deps_range-fast_11bytenop+fast_15bytenop-fast_7bytenop+fast_bextr-fast_dpwssd-fast_gather-fast_hops+fast_imm16+fast_lzcnt+fast_movbe+fast_scalar_fsqrt+fast_scalar_shift_masks-fast_shld_rotate-fast_variable_crosslane_shuffle+fast_variable_perlane_shuffle+fast_vector_fsqrt-fast_vector_shift_masks-faster_shift_than_shuffle+fma-fma4+fsgsbase+fsrm+fxsr-gfni-harden_sls_ijmp-harden_sls_ret-hreset-idivl_to_divb+idivq_to_divl-inline_asm_use_gpr32-invpcid-kl-lea_sp-lea_uses_ag-lvi_cfi-lvi_load_hardening-lwp+lzcnt+macrofusion+mmx+movbe-movdir64b-movdiri-movrs-mwaitx-ndd-nf-no_bypass_delay-no_bypass_delay_blend-no_bypass_delay_mov-no_bypass_delay_shuffle+nopl-pad_short_functions+pclmul-pconfig-pku+popcnt-ppx-prefer_128_bit-prefer_256_bit-prefer_mask_registers-prefer_movmsk_over_vtest-prefer_no_gather-prefer_no_scatter-prefetchi-prefetchwt1+prfchw-ptwrite-push2pop2-raoint+rdpid-rdpru+rdrnd+rdseed-retpoline-retpoline_external_thunk-retpoline_indirect_branches-retpoline_indirect_calls-rtm+sahf+sbb_dep_breaking-serialize-seses-sgx+sha-sha512+shstk-slow_3ops_lea-slow_incdec-slow_lea-slow_pmaddwd-slow_pmulld-slow_shld-slow_two_mem_ops-slow_unaligned_mem_16-slow_unaligned_mem_32-sm3-sm4+smap+smep-soft_float+sse+sse2+sse3+sse4_1+sse4_2+sse4a-sse_unaligned_mem+ssse3-tagged_globals-tbm-tsxldtrk-tuning_fast_imm_vector_shift-uintr-use_glm_div_sqrt_costs-use_slm_arith_costs-usermsr+vaes+vpclmulqdq+vzeroupper-waitpkg-wbnoinvd-widekl+x87-xop+xsave+xsavec+xsaveopt+xsaves-zu
test.h
Expected Behavior
On Zig 0.15.1, the header gets translated and it spits out zig code, without having to remove any lines. The full header in the miniz lib I mentioned above also seems to translate successfully in zig 0.15.1