https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95700
Bug ID: 95700
Summary: read-md.c: "missing sentinel in function call" when
building gcc with musl
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: iii at linux dot ibm.com
Target Milestone: ---
I'm trying to bootstrap gcc on gcc301 with --disable-multilib
--build=x86_64-alpine-linux-musl. The following error occurs:
/home/iii/gcc/regtest-f8a59086423e/build/./prev-gcc/xg++
-B/home/iii/gcc/regtest-f8a59086423e/build/./prev-gcc/
-B/home/iii/gcc/regtest-f8a59086423e/install/x86_64-alpine-linux-musl/bin/
-nostdinc++
-B/home/iii/gcc/regtest-f8a59086423e/build/prev-x86_64-alpine-linux-musl/libstdc++-v3/src/.libs
-B/home/iii/gcc/regtest-f8a59086423e/build/prev-x86_64-alpine-linux-musl/libstdc++-v3/libsupc++/.libs
-I/home/iii/gcc/regtest-f8a59086423e/build/prev-x86_64-alpine-linux-musl/libstdc++-v3/include/x86_64-alpine-linux-musl
-I/home/iii/gcc/regtest-f8a59086423e/build/prev-x86_64-alpine-linux-musl/libstdc++-v3/include
-I/home/iii/gcc/regtest-f8a59086423e/libstdc++-v3/libsupc++
-L/home/iii/gcc/regtest-f8a59086423e/build/prev-x86_64-alpine-linux-musl/libstdc++-v3/src/.libs
-L/home/iii/gcc/regtest-f8a59086423e/build/prev-x86_64-alpine-linux-musl/libstdc++-v3/libsupc++/.libs
-c -g -O2 -fno-checking -gtoggle -DIN_GCC -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wno-error=format-diag -Wmissing-format-attribute
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -Werror -fno-common -DHAVE_CONFIG_H -DGENERATOR_FILE
-fno-PIE -I. -Ibuild -I../../gcc -I../../gcc/build -I../../gcc/../include
-I../../gcc/../libcpp/include \
-o build/read-md.o ../../gcc/read-md.c
../../gcc/read-md.c: In member function ‘const char*
md_reader::join_c_conditions(const char*, const char*)’:
../../gcc/read-md.c:158:58: error: missing sentinel in function call
[-Werror=format=]
158 | result = concat ("(", cond1, ") && (", cond2, ")", NULL);
| ^
../../gcc/read-md.c: In member function ‘void
md_reader::handle_enum(file_location, bool)’:
../../gcc/read-md.c:947:58: error: missing sentinel in function call
[-Werror=format=]
947 | value_name = concat (def->name, "_", name.string, NULL);
| ^
../../gcc/read-md.c: In member function ‘void
md_reader::handle_include(file_location)’:
../../gcc/read-md.c:1072:57: error: missing sentinel in function call
[-Werror=format=]
1072 | pathname = concat (stackp->fname, sep, filename, NULL);
| ^
../../gcc/read-md.c:1085:47: error: missing sentinel in function call
[-Werror=format=]
1085 | pathname = concat (m_base_dir, filename, NULL);
| ^
cc1plus: all warnings being treated as errors
musl has the following commit:
https://git.musl-libc.org/cgit/musl/commit/?id=c8a9c22173f485c8c053709e1dfa0a617cb6be1a,
which suggests that C++ (as opposed to plain C) should allow plain (uintptr_t)0
as a sentinel value.
gcc wants either a pointer or __null though:
https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/c-family/c-common.c;h=b1379faa412e3646a443969c0067f5c4fb23e107;hb=929fd91ba975eebf9e57f7f092041271dcaf0c34#l5385
Would it be possible to allow (uintptr_t)0 as a valid sentinel value for C++?
Or is it musl that is wrong here?
