在编译Deal.II 6.0.0, 遇到如下问题：

source/parsed_function.cc:86: error: ‘sscanf’ was not declared in this scope

google 一下原因，原来是编译器的原因。

 

解决办法：

在parsed_function.h中加入 #include <cstdio>，then every thing is OK.

 

The following is the original words: (http://www.cyrius.com/journal/gcc)

C++ header dependencies got cleaned up in GCC 4.3, which broke a lot of code which relied on headers to be included indirectly through some other headers. I found some new build failures with GCC 4.4 related to missing #includes; in particular, #include <cstdio> is missing in a lot of code.

Typical errors look like these:

error: 'sscanf' was not declared in this scope error: 'EOF' was not declared in this scope error: '::fseek' has not been declared error: 'uint32_t' does not name a type 

Below is a table showing which header needs to be included for a number of common functions:

Functions and defines	Header
fopen, fwrite, fclose	cstdio
fread, fseek, feof	cstdio
sscanf, sprintf	cstdio
rename, open	cstdio
EOF	cstdio
memset, memcpy, strdup	cstring
va_list	cstdarg
int16_t, uint32_t	stdint.h

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