[Bug 234004] r342058 lib/libc/include/fpmath.h:36:10: fatal error: _fpmath.h: No such file or directory

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234004

            Bug ID: 234004
           Summary: r342058 lib/libc/include/fpmath.h:36:10: fatal error:
                    _fpmath.h: No such file or directory
           Product: Base System
           Version: CURRENT
          Hardware: riscv
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: dclarke at blastwave.org

Seen in the last few days :

make buildworld -j 4 TARGET_ARCH=riscv64 CROSS_TOOLCHAIN=riscv64-gcc
.
.
.
--- lib/msun__L ---
/usr/local/bin/riscv64-unknown-freebsd12.0-gcc
--sysroot=/usr/obj/usr/src/head/riscv.riscv64/tmp
-B/usr/local/riscv64-unknown-freebsd12.0/bin/  -O2 -pipe
-I/usr/src/head/lib/msun/ld128 -I/usr/src/head/lib/msun/riscv
-I/usr/src/head/lib/msun/src -I/usr/src/head/lib/libc/include 
-I/usr/src/head/lib/libc/riscv64 -march=rv64imafdc -mabi=lp64d   -g -MD 
-MF.depend.s_clog.o -MTs_clog.o -std=gnu99 -fstack-protector-strong
-Wsystem-headers -Werror -Wno-pointer-sign -Wno-error=address
-Wno-error=array-bounds -Wno-error=attributes -Wno-error=bool-compare
-Wno-error=cast-align -Wno-error=clobbered -Wno-error=enum-compare
-Wno-error=extra -Wno-error=inline -Wno-error=logical-not-parentheses
-Wno-error=strict-aliasing -Wno-error=uninitialized
-Wno-error=unused-but-set-variable -Wno-error=unused-function
-Wno-error=unused-value -Wno-error=misleading-indentation
-Wno-error=nonnull-compare -Wno-error=shift-negative-value
-Wno-error=tautological-compare -Wno-error=unused-const-variable
-Wno-error=bool-operation -Wno-error=deprecated -Wno-error=expansion-to-defined
-Wno-error=format-overflow -Wno-error=format-truncation
-Wno-error=implicit-fallthrough -Wno-error=int-in-bool-context
-Wno-error=memset-elt-size -Wno-error=noexcept-type -Wno-error=nonnull
-Wno-error=pointer-compare -Wno-error=stringop-overflow
-Wno-error=aggressive-loop-optimizations -Wno-error=cast-function-type
-Wno-error=catch-value -Wno-error=multistatement-macros -Wno-error=restrict
-Wno-error=sizeof-pointer-memaccess -Wno-error=stringop-truncation
-Wno-unknown-pragmas     -c /usr/src/head/lib/msun/src/s_clog.c -o s_clog.o
--- lib/msun__L ---
In file included from /usr/src/head/lib/msun/src/s_clog.c:33:
/usr/src/head/lib/libc/include/fpmath.h:36:10: fatal error: _fpmath.h: No such
file or directory
 #include "_fpmath.h"
          ^~~~~~~~~~~
compilation terminated.
*** [s_clog.o] Error code 1

make[4]: stopped in /usr/src/head/lib/msun
1 error

make[4]: stopped in /usr/src/head/lib/msun
*** [lib/msun__L] Error code 2

make[3]: stopped in /usr/src/head
--- secure/lib/libcrypto__L ---
A failure has been detected in another branch of the parallel make

make[4]: stopped in /usr/src/head/secure/lib/libcrypto
*** [secure/lib/libcrypto__L] Error code 2

make[3]: stopped in /usr/src/head
--- lib/ncurses/ncursesw__L ---
A failure has been detected in another branch of the parallel make

make[4]: stopped in /usr/src/head/lib/ncurses/ncursesw
*** [lib/ncurses/ncursesw__L] Error code 2

make[3]: stopped in /usr/src/head
--- lib/ncurses/ncurses__L ---
A failure has been detected in another branch of the parallel make

make[4]: stopped in /usr/src/head/lib/ncurses/ncurses
*** [lib/ncurses/ncurses__L] Error code 2

make[3]: stopped in /usr/src/head
4 errors

Seems repeatable.

However there were no suhc issues with r341837.

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